Metro Police officers and members of the Nashville Fire Department walk through the plane crash site at the Bellevue YMCA on Thursday, Feb. 6, 2014.

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The discovery of more hazardous material at the site of a deadly plane crash kept the Bellevue YMCA from opening Thursday.

Federal investigators had blocked off the Y's property for days while investigating the Monday crash, which killed all four people aboard but didn't injure anyone on the ground. Y officials had hoped to reopen around noon Thursday but did not get clearance from Metro Police, according to Jessica Fain, senior vice president of marketing and communications for the YMCA of Middle Tennessee.

Several Y staffers and members returned to the area Thursday morning to get their ...